To use these shirts, simply put them on and enjoy their comfort. When it's time to clean, machine wash them in cold water inside out with similar colors. Only use non - chlorine bleach if needed. After washing, hanging them to dry will give the best results, but you can also use a tumble dryer on cool or low heat. Remember, fabric softener can make the colors fade, so don't use it. Also, don't iron or dry clean these shirts to keep them in good condition.